Derivative Financial Instruments - Schedule of Pre-tax Amounts Recognized in AOCL on Interest Rate Swap (Detail) $ in Thousands	12 Months Ended
	Sep. 30, 2023 USD ($)
Derivative Instruments, Gain (Loss) [Line Items]
Net gain (loss) recognized in other comprehensive income (loss)	$ 260
Reclassification of net (gain) loss to interest expense	$ (77)
Derivative Instrument, Gain (Loss) Reclassified from AOCI into Income, Effective Portion, Statement of Income or Comprehensive Income [Extensible Enumeration]	Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), Adjustments, after Tax
Ending unrealized net gain (loss) in AOCL	$ 183